Add small talk, banter, and shooting the shit into that. And, maybe, becoming friends or at least more acquainted.
There's a whole breadth of interpersonal communication and humanity that exists outside of the realm of politics, society, and activism. It's self evident, otherwise what do you expect to achieve from talking politics and activism except to be able to talk even more about politics and activism?
If you're tendentious enough, you can make anything political. But if you start talking about the post-colonial geopolitical implications of your coworker's son's new chocolate chip cookie recipe, expect everyone to roll their eyes and walk away.